 
(* ::Section:: *)
(* CSI *)
(* ::Text:: *)
(*CSI[i] can be used as input for 3-dimensional $\sigma ^i$ with 3-dimensional Cartesian index i and is transformed into PauliSigma[CartesianIndex[i]] by FeynCalcInternal..*)


(* ::Subsection:: *)
(* See also *)
(* ::Text:: *)
(*PauliSigma.*)



(* ::Subsection:: *)
(* Examples *)



CSI[i]

CSI[i,j]-CSI[j,i]

StandardForm[FCI[CSI[i]]]

CSI[i,j,k,l]

StandardForm[CSI[i,j,k,l]]
